@w:500px;
@h:500px;
@size:16px;
@ml:100px;

div{
    width: @w;
    height: @h;
    background: red;
    p{
        width:(@w - @size);
        height: (@h + 200px);
        font-size: (@size * 5);
        margin-left: (@ml / 6); 
        background: #FF0 - #369;
    }  
}